find the sum of numbers in an AR
1 + 3 + 5 + 7.......149
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S=5625
explain
a =1,d =2
an= a + (n-1)d
an = 1 + 2n -2
149 = -1+2n
150/2 =n
n = 75
s = 75/2(2+74×2)
s= 75/2 ×150
s = 5625
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